Weight training

Weight training is a common type of strength training for developing the strength and size of skeletal muscles. It uses the force of gravity (in the form of weighted bars, dumbbells or weight stacks) to oppose the force generated by muscle through concentric or eccentric contraction. Weight training uses a variety of specialized equipment to target specific muscle groups and types of movement.
Weight training differs from bodybuilding, weightlifting, powerlifting, and strongman, which are sports rather than forms of exercise. Weight training, however, is often part of the athlete's training regimen.

Weight training versus other types of exercise
Strength training is an inclusive term that describes all exercises devoted toward increasing physical strength. Weight training is a type of strength training that uses weights rather than elastic or muscular resistance to increase strength. Endurance training is associated with aerobic exercise while flexibility training is associated with stretching exercise like yoga or pilates. Weight training is often used synonymously of strength training but is actually a specific type within the more inclusive category.